The head chef of a restaurant has the right to kick out unruly customers. The head chef of a restaurant has the right to refuse service to any customer. This may decrease revenue to the restaurant because the head chef is turning away customers, but it is still the head chef's right.
Why should this be any different?
As for that Japanese fan's response:
1) It doesn't address any of the points that Rena brought up; namely, that if abusive behavior continues handshake events will no longer be held and everybody loses. This is a very strong argument.
2)
"In society, people making unreasonable demands are an everyday occurrence, and failure to be able to satisfy these demands is largely due to one's own fault; it's an embarrassment."...What? This is nonsense. External circumstances are external circumstances, and the definition of an unreasonable demand is that it cannot be carried out, therefore the burden lies on the person who made the demand in the first place.
In addition, just because society is a certain way doesn't mean that it's automatically right. The reason why the girls write such things is to highlight a situation in society (in this case, fandom society) that is wrong so that steps can be taken to fix it, and thus improve society.
3)
"If there's any trouble, blaming the patrons is barking up the wrong tree." Again, nonsense. Sometimes the patrons really are wrong, and the franchise is under no obligation to tolerate it. The franchise is now large enough that it can afford to be more picky about who their patrons are. This includes excluding toxic patrons.
See also my head chef example. Even if it's barking up the wrong tree, the franchise has that right.
4)
"Anything that cannot be handled on a personal level should be referred to a superior, who will then make the judgement."Who says she didn't?
Besides which, Aki-P decreed G+ to be an open forum with no censorship, and the girls are entitled to their own opinions. Their G+ accounts are not property of the company, as Nacchan and Yonechan still have their accounts, but just are no longer affiliated with AKB48. This means that they are not restricted to their idol persona on G+, and are not obligated to be shitting rainbow dust 24/7 on G+. It may be more beneficial for them to be idols 24/7 on G+, but by no means do they HAVE to run every opinion through a superior.
5)
"If there's no resolution, its just a matter of stopping (withholding) service. To preach to patrons is an unbelievable occurrence." This is being unfair to the patrons who have done no wrong, because it gives them no warning as to why service is suddenly being withheld. The "good" patrons should have a chance to self-police and prevent it from happening in the first place. This is more effective in the long run because it prevents abuse from occurring in the first place instead of waiting until after it's occurred to inflict punishment, in which both the franchise and the patrons suffer.
See also point 2) about the benefits of raising awareness about an issue amongst the general fanbase to improve society.
6)
"In any case, I believe that when the girls go for handshakes, they put themselves on the line (for criticism, abuse, et al) as a way to sell CDs, that is a decision they made."This does not absolve the fans' responsibility to be decent people. And there is nothing wrong with telling scumbags that they're scumbags. See point 2) about how status quo is not automatically good.
More importantly, this line of thinking objectifies the idols and in effect creates a slave-master dynamic to the idol-fan relationship, which is all sorts of wrong and fucked up. Just because you bought the CD doesn't mean you own them, bub. As Metro Man said, "Warranties are invalid, if used beyond their intended purpose!"
7)
"Also, if anything, the frequently absent (due to illness) and harsh expressions that Matsui Rena shows are the breach of manners, in my opinion." Seriously? You lose all credibility with this statement.
8 )
"PS: I also posted this on her entry, but because it's regulated it's already been deleted. I do not think it's fair that members get to criticise fans with no way for us to reply."Gee, it's not like you can't criticize them at handshake events to their face or anything. Oh wait...
Also, the kind of stupidity spouted in this doesn't need to be spread around, so it's probably for the better that it was deleted. (Especially that last statement. Shut the fuck up, douchebag.)